Pump valve



Patented lAug. 13, 1935 UNITED STT ES 'Y "PTEI" OFFICE I,

2,011,547 v PUMP vALvn George E. Campbell, Chattanooga, Tenn., as-

signor to The Wheland Company, Chattanooga,` Tenn., a corporation of Tennessee VApplication August 6, 1930, serial Nu. 473,453

s Claims. (i. 251-144) strengthened by the valve body 6, resting on its This invention relates to an improvement in pump valves, and is designed primarily for use in the mud-end of a duplex reciprocating pump.

The object of the invention is v to materially improve the action of pump valves of this character to more effectively seal the communication between the pressure and discharge chambers of the pump, by improving the structure of the valve and its `action for this purpose.

In the accompanying drawings: y

Fig. l is a sectional view through the complete valve applied;

Fig. 2 is a transverse sectional View on the line 2-2 of Fig. 1;

Fig. 3 is a sectional view through the valve of a modication showing the iluted fnut and valve plate separate; andv Fig. 4 is a top plan view of the uted nut of Figure 3. g

Thev body of the pump is provided with the pressure chamber 2 and a discharge chamber 3 through which the liquid or iiuid is forced under pressure.

Arranged between the chambers 2 and 3 and having a downwardly tapered'flt therein is a valve ring 4, which is provided with a valve seat 5, the engaging Surface of which is frustro-conical, being at an angle of about with the horizontal.

A valve body 6 is constructed to iit the seat 5 and is guided in its up and down movement by crow-feet 'I carried by the lower face thereof, and which crow-feet lit loosely within the valve ring 4.

The valve body 6 is carried on the lower end of a valve stem 8 received within a fluted sleeve 9 formedintegral with and extending upwardly from a valve plate I0. Anut II is threaded onto the upper end of the valve stem 8 to hold the valve stem and iiuted sleeve 9 together.

A rubber valve insert I2 is interposed between the valve body 6 and the valve plate III and has its outer face formed to.t the valve seat- 5 as a continuation of the surface of the valve body 6.

perfect water-seal.

The water or`mud pressure that the valve must seal oif is always applied to the top side of the `valve. This water pressure is 'applied against the exposed rubber insert and is sealed off thereby, the rubber in turn being -backed up and seat in the valve ring 4. The rubber being pliable easily adapts itself to any roughness of the seat and prevents leakage. The rubber insert I2 may be `made in other shapes than that shown in the drawings if desired.

The iluted sleeve 9 is slidably mounted for up I and down movement in a bushing I3, removably received in a valve guide III, surrounding the bushing and depending from a valve pot cover I5, which extends into the opening I6 above the4 valve and through the top of the cover to close Y this opening. The sleeve 9 is fluted on its 'external surface so as to reduce friction to a mini' mum, and it may be removed and replaced when Worn'. y

The bushing I3 is also made removable from its recess in the valve guide I4 in order to be replaced when worn.

An annular shoulder I 1 is formed in the opening I6 near the lower end thereof, while a cooperating shoulder I8 is formed about the lower end of the valve pot cover I5, and interposed between these shoulders I1 yand I9 is a gasket I9, which is thus located just above the iiuid cham-.- ber 3 so as to seal off the opening I6 at its lower end.

Heretofore, it has been customary to locate the packing gasket at the extreme top of the valve pot opening, thereby exposing the entire cavity to the high-water pressure and which has been the cause of much-damage and breakage. is obviated by the location of the gasket I9 near the lower end of the opening I6.

The valve 6 i5 normally pressed downward by a. spring 20, whichl is interposed between the lower end of the` valve pot cover I5 andthe valve plate I0, the spring being sleeved over the valve guide I4.

Various modications might be made 'in the valve without departing from the invention, as for instance, the making of the plate I Il separate from the uted sleeve 9', as shown in Fig. 3. In this form, the upper end of the sleeve is internally threaded as at 2l (see Fig. 4) to be threaded onto the threaded upper end of the valve stem E'. The nut II may thus be dispensed with.

This

Notches 22 are formed in the upper end of the fiuted sleeve 9 to receive a locking pin to secure the fluted sleeve against turning relative to the 'pressure chamber 2 causes the mud or water to bepushed upward throughthe valve ring I, lift- .the valve will not properly seat land it is necesing orpushingthe valve body t 'offits seat and forcing this iluid out through the :discharge chamber 3. As soon asvthe piston stops, the weight of the valve as well as the spring 2l returnsi the valve to its seat, so that it acts as a check-valve. In this up and down movement, the valve is guided bythe fluted sleeve S, acting in the removable bushing I3, but when wear becomes substantial V ing imder surface'extending to the periphery of said valve body, and an exposed upper surface extending upwardly from said seat-engaging surface at an angle such that fluid pressure acting thereon presses the under'surface against the seat, a valve stem connected with the valve body and extending upwardly therefrom, a sleeve surrolmding said valve stem, a plate connected with then lower end of the sleeve and bearing against e upper side of the packing insert, and means for applying pressure on the upper end of the y sleeve to hold the packing insert in place.

2. A fluid valve comprising a, valve body having -a downwardly beveled peripheral a packing insert applied to the beveled peripheral surface thereof, and a plate separate from the valve body bearing against the upper side of the packing insert to hold said insert in place, means for applying pnossure on said plate, said packing insert protruding laterally beyond the peripheries of the valve body and plate and having a seatengaging under surface in said protruding portion, and an upper surface which in cross section is concave, being curved from a point adjoining the seat-engaging surface to a. point approxlmately at the periphery of the plate with the outer edge thereof below the plate, so that top iiuid pressure acting thereon fr'ces the insert against its Seat.

V- 3. A huid valve comprising a valve body adapted to cooperate with a valve' seat, a packing insert of yieldable material htted to the upper sideA of the valve body and having a peripheral iiexible feather-edge, and a plate vbearing lagainst the upper side of the packing insert, said feather-edge extending horizontally below the platea substantialdistance beyond the peripherieaof the valve body and plate in position to be` forced against the valve seat byI overhead iiuid pressure acting on said feather-edge and on the plate, and said feather-edge having a concave upper surface fac- 1 ing the iiuid and against which the fluid pressure acts.

4. A fluid valve comprising a valve body adapted to cooperate with a valve seat, and having a` truncated-conical periphery, 'a resilient packing insert fitted to the truncated-conical periphery of the valve body and having a peripheral exl ible' feather-edge, a plate bearing against the upper side of the packing insert vand movable relative to the valve body, .and resilient means bearing against the upper side of the plate, the

feather-edge of the packing insert extending radially a substantial distance beyond the peripheries of the valve body and plate and having a@ 15 concave upper surface curved in cross-section approximately from the edge of the plate tothe periphery of the feather-edge and against which overhead iiuid pressure acts to force said featheredge against the seat.

5,. A fluid valve comprising a valve body having a seat portion, and -having an upper surface terminating in a downwardly beveled outer edge portion, said beveled edge extending to the edge of the upper surface, a valve the seat engaging portion of the valve body and extending downwardly and beyond the peripheries of the valve body and plate, and means connected with the valve stem for applying downward pressure on the insert and cooperating with the beveled portion of the valve body to force the insert laterally beyond the seat engaging portion of -the peripheral edge of the valve body.A

6. A packing insert adapted to be applied to a valve body of a fluid valve, said packing insert being constructed of yieldable material and having an external lperipheral flexible feather edge, said feather 'edge having a concave upper peripheral surface and a atplate-engaging top inwardly of said concave surface with the concave surface portion extending to the external periphery and adapted to face the iiuid and against which the fluid pressure acts, said packing insert having a. seat-engaging lower surface inclined downwardly from the periphery thereof in position to be forced into contact with a seat by the overhead fluid premura acting on the concave upper-sin'iace with its under surface `inwardly of said downwardly inclined portion inclined upwardly in pod'tion for a tapered valve bOdy.

GEORGE E. CAMPBEIL. 

